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Mechanism of color tuning in proton transporter Bacteriorhodopsin

  • CHEN De-Liang ,
  • ZHAO Qian ,
  • HAN Rui
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  • 1-oxyl-2,2,5,5,-tetramethylpyrroline-3-methyl

Received date: 2010-01-21

  Revised date: 2010-04-13

  Online published: 2010-09-15

Abstract

The color tuning in Bacteriorhodopsin is mostly caused by mutated residues which directly interact with retinal. In the present study, we have found a significant color tuning at Ile78 substituted with a non-native residue R1. However, no color tuning at Gln75, Asn76, Thr128, Lys129, or Leu61 was observed. In Bacteriorhodopsin photocycle, the lifetime of M412 was significantly prolonged after the substitution. The structural analysis suggested that R1 might have a direct contact with the "water trimer" and interact with retinal through the long-distance hydrogen bonded network.

Cite this article

CHEN De-Liang , ZHAO Qian , HAN Rui . Mechanism of color tuning in proton transporter Bacteriorhodopsin[J]. Journal of University of Chinese Academy of Sciences, 2010 , 27(5) : 632 -637 . DOI: 10.7523/j.issn.2095-6134.2010.5.008

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